Electrical converter



(No Model.)

G. WESTINGHOUSE, Jr.

ELECTRICAL CONVERTER.

No. 366,544. Patented July 12, 1887.

- UNITED 'STATES', PATENT OFFICE.

GEORGE WVESTINGHOUSE, JR, OF PITTSBURG, PENNSYLVANIA.

. ELECTRICAL CONVERTER.

SPECIFICATION forming part of Letters Patent No. 366,544, dated July 12, 1857.

Application filed December 31, 1886. Serial No. 223,106.

To all'whom, it may concern.-

Be it known that I, GEORGE WESTING- HOUSE, Jr., a citizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Electric Converters, of which the following is a specification.

The invention relates to theclass of apparatus employed for transforming alternating and intermittent electric currents of any required character into currents differing there from in one or both characteristics. For this purpose induction coils or converters are employed, the primary and secondary coils being properly proportioned with reference to their lengths and conductivities.

The presence of moisture,when the converters are kept in more or less damp places, is liable to cause a short circuit in one or both of .the coils.

The primary object of this invention is to provide means for excluding moisture from the converter, and so protecting it that it may be kept in damp places, or even surrounded by water, without injury.

The accompanying drawing isa section of a converter and inclosing-case embodying the features of the invention.

Referring to the figure, 0 represents a converter, which, while it may be of any convenient form, is preferably constructed with a core composed of thin iron plates b b, magnetically separated from each other, and carrying the primary and secondary coils c, the terminals of which are shown at pp and s s". This in vention is not, however confined to any particular form of converter. Whatever be the form of converter adopted, it is firstpreferably inclosed in a gas or air tight case, D. This may with advantage consist of thin sheet metal, lead, copper, or other suitable material securely soldered. The case D, after the converteris in place, may be filled with a gas,serving to keep out moisture. This last precaution may not be necessary, however, in all instances.

Surrounding the case D is an iron or other strong box, E,which is of such size as to leave aspace between the two. This space is designed to be filled with some material, such as tar, pitch, insulating compounds, or other suitable material adapted to exclude moisture.

(No model.)

When a more or less solid material is used, it is meltedand poured into the case and allowed to harden in position. This completely prevents moisture from reaching the converter.

The case E is preferably made in two sec tions, E and E of cast-iron, and these are bolted or otherwise securely fastened together. The joint between the two is sealed in any Well-known manner.

The wires 1) p and s s from the primary and secondary coils of the converter are led through suitable apertures to an outer box, F, in which the switches and circuit-controlling devices are to be placed- The conductors of the converter lead through a plate, f, placed at the inner end of this box. the box is closed by a cap, G. A washer, g, secures a tight joint at this point and prevents airand moisture from entering the box. When the circuit-controlling devices require attention, they may be reached by removing the cover G,without breaking into the convertervbox or the box E. The cover G may be constructed with a glass plate, through which the circuit-controller may be seen without removing'the cover.

It may in some instances be desirable to lead one or more ventilating-pipes, 72, from the converter through both cases. These are useful when itis not desired to surround the converter by air directly, or when it may be desired to fill. the case D with gas from any convenient sourcesucn as a gas-main, for instance.

I claim as my invention- 1. The combination, with an electrical converter, of an air-excluding case surrounding the same, and a gaseous fluid within the case, replacing, the air.

2. The combination of an electrical converter, a sealed case inclosing the same, and a moisture-excluding substance surrounding the case.

3. The combination, substantially as described, of an electrical converter, an inclosing-case for the same, a wall surrounding said' ease, and a filling of moistui'eexcluding material between said case and wall. I

4. The combination, substantially as described, of an electrical converter, asurrounding wall inclosing the same, and a moisture excluding substance within said wall.

5. A 01.86 for electrical converters, in com- The outer end of binntion with an air-tight compartment for re rounding the same, and one or more tnbeslezuleeiving the terminals of the primary and sec ing' from the converter through said case. ondary conductors and a wall between the In testimony WhereofI have hereunto subtwo. i scribed my name this 27th day of October, A. 5 6. A case for e1eetric converters constructed 1 D. 1886.

in two sections, one section carrying an air- I T 1 4 r T 4 tight compartnicnt'forreceiving the terminals BS1 m (not of the primary and secondary conductors. \Vitnesses:

7. The combination of an electric converter, CHARLES A. TERRY,

IO an air-tight covering for the some, a case snr- XVALTER D. UPTEGRAFF. 

